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一、概况李家寨变电所(简称李SS)是京广线郑武段一牵引变电所,供电方式为双T(一次)、母线分断(二次)、AT供电方式。馈线保护方式设阻抗保护Ⅰ、Ⅱ、Ⅲ段及过流保护。1998年8月3日5时31分,李SS馈线断路器213DL跳闸。信号显示为阻抗Ⅰ、Ⅱ、Ⅲ段掉黄牌,阻抗跳闸掉红牌;过流跳闸掉红牌,电流2000A。馈线断路器214DL。跳闸,信号显示为过流跳闸掉红牌,电流2000A。同时主变断路器102DL过流保护跳闸,信号显示为两相
First, an overview Lijiazhai Substation (referred to as Lee SS) is a section of the Beijing-Guangzhou line Zhengwu a traction substation, power supply for the double T (once), bus break (second), AT power supply. Feeder protection mode set impedance protection Ⅰ, Ⅱ, Ⅲ and overcurrent protection. At 5:31 on August 3, 1998, Li SS feeder circuit breaker 213DL tripped. The signal is displayed as impedance Ⅰ, Ⅱ, Ⅲ out of the yellow card, the impedance tripping off the red card; over-current trip red card out, the current 2000A. Feeder circuit breaker 214DL. Tripping, the signal shows the red card tripping red current, current 2000A. At the same time, the main circuit breaker 102DL overcurrent protection trip, the signal is displayed as two phases